Benchmark: Compare performance between Dayjs.tz and Temporal.ZonedDateTime

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/dayjs@1/dayjs.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/dayjs@1/plugin/timezone.js"></script>
<script src="https://cdn.jsdelivr.net/npm/dayjs@1/plugin/arraySupport.js"></script>
<script src="https://cdn.jsdelivr.net/npm/dayjs@1/plugin/utc.js"></script>
<script src='https://cdn.jsdelivr.net/npm/temporal-polyfill@0.3.0/global.min.js'></script>

Script Preparation code:

dayjs.extend(window.dayjs_plugin_timezone);
dayjs.extend(window.dayjs_plugin_arraySupport);
dayjs.extend(window.dayjs_plugin_utc);

Tests:

Create a Dayjs.tz
dayjs.tz([2025, 7, 1], "Europe/London").endOf("month");
Create a Temporal.ZonedDateTime
const dt = Temporal.ZonedDateTime.from({ year: 2025, month: 8, day: 1, timeZone: "Europe/London" }); dt.with({ day: dt.daysInMonth, hour: 24, minute: 59, second: 59, millisecond: 999 });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Create a Dayjs.tz
Create a Temporal.ZonedDateTime

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 months ago)

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:145.0) Gecko/20100101 Firefox/145.0

Browser/OS: Firefox 145 on Ubuntu

View result in a separate tab

Test name	Executions per second
Create a Dayjs.tz	4817.2 Ops/sec
Create a Temporal.ZonedDateTime	54611.4 Ops/sec

Related benchmarks:

Compare performance between Dayjs.tz and Temporal.ZonedDateTime (version: 6)

Get the end of month of an arbitrary month with both.

Comparing performance of: Create a Dayjs.tz vs Create a Temporal.ZonedDateTime

Created: 8 months ago by: Registered User

Jump to the latest result

Create a Dayjs.tz

Create a Temporal.ZonedDateTime

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A